Is satellite disposal a problem? It is. But there is a better way to solve the issue than eliminate capabilities or mandating further studies. Change materials. Today, most satellites use aluminum, steel, tungsten, and other exotic metals. Stop building with them. Instead use carbon fiber structures, other composites, copper, etc. It requires a shift in thinking away from just the mission an into a total lifecycle process.
It helps to think smaller too. Satellites don't need to be as massive as they are today. Smaller is better. Focus more on CubeSats as opposed to school bus sized spacecraft.